Compatilizer as well as preparation method and application thereof

Abstract

The invention provides a compatilizer as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The compatilizer is composed of a polyolefin elastomer, a grafting monomer and an initiator; wherein the graft monomer is cis-1, 2, 3, 6-tetrahydrophthalic anhydride, and the graft monomer is 2, 2, 3, 6-tetrahydrophthalic anhydride; the addition amount of the grafting monomer accounts for 2-10 wt% of the polyolefin elastomer. According to the technical scheme of the invention, the compatibilizer is prepared by grafting cis-1, 2, 3, 6-tetrahydrophthalic anhydride with POE, and an anhydride monomer can chemically react with a terminal amino group of polyamide, so that the interface bonding force between a dispersed phase and a matrix is improved; meanwhile, the anhydride group can also react with hydroxyl and other groups on the surface of the glass fiber, and polyolefin at the other end is entangled with a nylon chain, so that the interface bonding effect between the glass fiber and nylon is improved, and the mechanical property of the nylon composite material is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a compatibilizer, a preparation method and application thereof. Background Art

[0002] Polyamide (commonly known as nylon) is a condensation-type polymer compound with repeating amide units in its main chain. It possesses excellent mechanical properties, processing properties, chemical corrosion resistance, and dimensional stability, making it widely used in electronics, automotive engineering plastics, textiles, packaging, and other fields. However, the most commonly used aliphatic nylon 66 and nylon 6 suffer from inherently low impact toughness, necessitating modification in practical applications. This includes physical blending and toughening, where toughening components such as ethylene propylene diene monomer (EPDM), polyolefin elastomer (POE), polypropylene (PP), and polyethylene (PE) are added to the matrix to enhance toughness. However, these toughening components, such as POE, are not highly compatible with polyamide, necessitating the addition of a compatibilizer to improve compatibility between the toughening component and the matrix resin. Conventional compatibilizers include EPDM grafted with maleic anhydride (EPDM-g-MA), POE grafted with maleic anhydride (POE-g-MA), and PP / PE grafted with maleic anhydride (PP / PE-g-MA). POE grafted with maleic anhydride is the most common compatibilizer, serving as a bridge to enhance the adhesion and compatibility between polar and non-polar materials. Its primary application is in nylon modification. Maleic anhydride-grafted POE can be used as a compatibilizer in nylon composites filled with glass fiber, talc, and calcium carbonate, improving the compatibility and adhesion between the nylon base material and the filler, significantly enhancing the mechanical properties of the composite. In nylon, it significantly improves the toughness and impact strength of the material. Maleic anhydride-grafted POE is typically prepared by using peroxide as an initiator. The grafted monomer, maleic anhydride, and the POE matrix resin are co-extruded in a twin-screw extruder. This process is characterized by its simplicity, convenience, and high throughput, leading to its widespread application. For example, the maleic anhydride-grafted POE provided by Chinese invention patent CN103450403A comprises 94.2-98.5% of a polyolefin elastomer, 0.8-2.0% of maleic anhydride, 0.05-0.5% of a peroxide initiator, and 0.15-0.8% of a heat stabilizer, and 0.5-2.5% of an acetone solvent is added. The mixture is uniformly mixed in a high-speed mixer and then extruded through a single-screw extruder.However, maleic anhydride grafted POE has the following technical problems: First, the melting point (51-56°C) and boiling point (202°C) of maleic anhydride grafting are not high, and it is easy to volatilize and degrade during the actual processing. A thermal stabilizer needs to be added to reduce the degradation reaction of maleic anhydride. Moreover, the maleic anhydride reaction is incomplete in the molten state, which will result in monomer residue, making the product have a strong odor. The residual peroxide initiator will slowly decompose over time, causing the degradation of the POE matrix resin, which in turn affects the mechanical properties; second, the grafting rate of maleic anhydride is not high and the grafting efficiency is low. If the initiator or monomer content is increased, it will cause problems such as degradation and cross-linking of POE; third, the traditional method is generally to distribute the grafting monomers and initiators such as maleic anhydride on the POE surface through solutions or liquids such as silicone oil. However, POE has a high viscosity during the melt grafting process, and it is difficult for the monomers and initiators to diffuse, so its reaction interface is small, resulting in a low grafting rate.

[0003] Based on the problems existing in the prior art, the present invention further makes technical improvements and provides a compatibilizer on the basis of the prior art, using cis-1,2,3,6-tetrahydrophthalic anhydride as a grafting monomer to replace the maleic anhydride in the prior art to carry out grafting modification of POE. The invention has the advantages of high grafting rate and simple preparation process. When used in combination with reinforcing materials containing groups such as hydroxyl groups, such as glass fiber, it can improve the interfacial bonding between it and nylon, thereby improving the fusion effect between it and nylon. Summary of the Invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a compatibilizer and its preparation method and application, so as to overcome the problems of processing technology limitations caused by the low melting point and boiling point of maleic anhydride in the prior art, and also have the advantages of simple preparation method, low cost and high grafting efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solutions.

[0006] One aspect of the present invention provides a compatibilizer consisting of a polyolefin elastomer, a grafting monomer and an initiator; wherein the grafting monomer is cis-1,2,3,6-tetrahydrophthalic anhydride.

[0007] Preferably, the added amount of the grafting monomer accounts for 2-10 wt % of the polyolefin elastomer.

[0008] Preferably, the initiator is a mixture of initiator A and initiator B.

[0009] More preferably, the initiator A is selected from 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide.

[0010] More preferably, the initiator B is at least one selected from dicumyl peroxide, di-tert-butyl peroxide, benzoyl peroxide, tert-butyl perbenzoate, and diisopropyl peroxydicarbonate.

[0011] As a preferred embodiment, the initiator is selected from 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide combined with diisopropylbenzene peroxide (NITR-DCP).

[0012] Preferably, in the initiator, the mass ratio of the initiator A to the initiator B is: 1: (1-1.2).

[0013] Preferably, the compatibilizer components are as follows, calculated in parts by mass: 100 parts of polyolefin elastomer, 2 to 10 parts of the grafting monomer, and 0.5 to 1 part of the initiator.

[0014] Another aspect of the present invention provides a method for preparing the aforementioned compatibilizer, comprising adding a polyolefin elastomer, a grafting monomer, and an initiator to a high-speed mixer for uniform mixing; then, feeding the mixture into a twin-screw extruder through a feed port, setting reaction conditions for reaction, and extrusion; finally, cooling and pelletizing to obtain a grafted product, namely, POE-g-TA.

[0015] Preferably, the reaction conditions include a reaction temperature of 200-220° C. and a screw speed of 200-300 rpm.

[0016] Preferably, the feeding speed is 10-20 rpm.

[0017] The above technical solution shows that the present invention uses cis-1,2,3,6-tetrahydrophthalic anhydride as a grafting monomer. This compound has a melting point of 101-102°C and a boiling point of 234.6°C. This monomer has higher melting and boiling points than maleic anhydride. In particular, it can meet the temperature requirements for melt extrusion during the grafting process, avoiding volatilization and degradation of the anhydride monomer.

[0018] As one aspect of the invention, the present invention also provides the use of the aforementioned compatibilizer in the preparation of modified nylon materials.

[0019] As one aspect of the invention, the present invention also provides a modified nylon material, comprising the aforementioned compatibilizer, nylon, and a toughening agent; the toughening agent is glass fiber.

[0020] Preferably, the modified nylon material comprises, by weight, 50-70 parts of the nylon, 25-40 parts of the glass fiber, 3-9 parts of the compatibilizer, and 0.2-0.4 parts of the antioxidant.

[0021] Preferably, the nylon is nylon 66 or nylon 6; and the antioxidant is antioxidant 1098.

[0022] The compatibilizer (POE-g-TA) prepared by the technical solution of the present invention has TA with both anhydride groups and double bond structures. The anhydride groups can react with hydroxyl-containing glass fibers, while the double bond structure at the other end is entangled with the long chains of nylon through hydrogen bonding, thereby enhancing the compatibility between the glass fibers and nylon.

[0023]

[0024] The technical effects of the technical solution of the present invention are as follows: 1. According to the technical solution of the present invention, the compatibilizer prepared by grafting POE with cis-1,2,3,6-tetrahydrophthalic anhydride can react chemically with the terminal amino group of polyamide, thereby improving the interfacial bonding force between the dispersed phase and the matrix; at the same time, the anhydride group can also react with the hydroxyl group and other groups on the surface of the glass fiber, and the polyolefin at the other end is entangled with the nylon chain, thereby also improving the interfacial bonding between the glass fiber and nylon, thereby improving the mechanical properties of the nylon composite material.

[0025] 2. The present invention uses cis-1,2,3,6-tetrahydrophthalic anhydride as a grafting monomer. This compound has a melting point of 101-102°C and a boiling point of 234.6°C. This monomer has a rigid cycloolefin structure with higher melting and boiling points, which can meet the temperature requirements for melt extrusion during the grafting process and avoid volatilization and degradation of the anhydride monomer.

[0026] 3. POE grafted cis-1,2,3,6-tetrahydrophthalic anhydride was prepared by nitrogen oxide stabilized free radical method, and the monomer grafting rate was increased through "active" free radical polymerization reaction.

[0027] 4. The grafting method adopted in the present invention does not require the addition of other solutions or the use of silicone oil, thereby avoiding the problem of difficulty in diffusion of monomers and initiators caused by the high viscosity of POE during the melt grafting process, thereby improving the grafting rate.

[0028] 5. The compatibilizer provided by the technical solution of the present invention is applied to the modification of thermoplastics, has the advantages of simple operation and easy control, and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the infrared spectrum of the compatibilizer POE-g-TA prepared in Examples 1 to 6 of the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] The disclosures of all patent and non-patent literature cited herein are incorporated by reference in their entirety.

[0032] As used herein, the terms "comprises," "includes," "contains," "covers," "has," "with," or any other variations thereof are intended to encompass non-exclusive inclusions. For example, a process, method, article, or apparatus that includes a list of elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to the process, method, article, or apparatus. In addition, unless expressly indicated to the contrary, "or" refers to an inclusive "or" and not an exclusive "or." For example, conditions A or B satisfy any of the following: A is true (or exists) and B is false (or does not exist), A is false (or does not exist) and B is true (or exists), and both A and B are true (or exist). The phrase "one or more" is intended to encompass non-exclusive inclusions. For example, one or more of A, B, and C means any of the following: A alone, B alone, C alone, a combination of A and B, a combination of B and C, a combination of A and C, or a combination of A, B, and C.

[0033] In addition, "a" or "an" is used to describe elements and components described herein. This is done merely for convenience and to provide a general sense of the scope of the invention. This description should be understood to include one or at least one, a kind or at least one, and the singular also includes the plural unless it is obvious that it is intended otherwise.

[0034] The present invention provides a compatibilizer, the raw materials of which are formulated as follows in parts by weight: 100 parts of polyolefin elastomer (POE), 2 to 10 parts of grafting monomer, and 0.5 to 1 part of initiator.

[0035] Preferably, the grafting monomer is selected from cis-1,2,3,6-tetrahydrophthalic anhydride (TA).

[0036] The initiator includes a compound initiator A+initiator B.

[0037] More preferably, the initiator A is selected from 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide.

[0038] More preferably, the initiator B is at least one selected from dicumyl peroxide, di-tert-butyl peroxide, benzoyl peroxide, tert-butyl perbenzoate, and diisopropyl peroxydicarbonate.

[0039] As a preferred embodiment, the initiator is selected from 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide combined with diisopropylbenzene peroxide (NITR-DCP).

[0040] Preferably, in the initiator, the mass ratio of the initiator A to the initiator B is: 1:(1-1.2).

[0041] The invention adopts a nitrogen-oxide-stabilized free radical method, prepares POE grafted cis-1,2,3,6-tetrahydrophthalic anhydride by compounding an initiator, and improves the monomer grafting rate through an "active" free radical polymerization reaction.

[0042] The present invention provides a method for preparing a compatibilizer, and the specific steps are as follows: The materials were weighed according to the set ratio and mixed thoroughly in a high-speed mixer. After mixing, they were fed into the feed port and fed into a twin-screw extruder at the set speed. Extrusion was carried out according to the set conditions. The extrudate was cooled in a cooling water tank and pelletized to obtain the POE-grafted TA product (POE-g-TA).

[0043] Preferably, the setting conditions are as follows: the processing temperature is set to 200 ~ 220 ° C, the screw speed is 200 ~ 300 rpm, and the feeding speed is 10 ~ 20 rpm.

[0044] The application and preparation method of the above compatibilizer in nylon is as follows: Weigh 50-70 parts nylon, 25-40 parts glass fiber, 3-9 parts compatibilizer, and 0.2-0.4 parts antioxidant 1098 in a high-speed mixer and mix thoroughly. Place the mixture in a twin-screw extruder at a temperature of 240-280°C, a screw speed of 300-400 rpm, and a feed speed of 10-20 rpm. Cool the extrudate in a cooling water tank and then pelletize to obtain modified nylon pellets.

[0045] Preferably, the nylon is one of nylon 66 and nylon 6.

[0046] The compatibilizer provided by the above technical solution can be applied to thermoplastic plastics.

[0047] In the process of co-processing the compatibilizer with the thermoplastic, processing aids and modifiers conventional in the art are also used, such as flame retardants, lubricants, UV absorbers, antioxidants, fillers, etc.

[0048] Unless otherwise defined, the meaning of all technical and scientific terms used herein is the same as that generally understood by those of ordinary skill in the art to which this disclosure belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the disclosed composition embodiments, suitable methods and materials are described below. Unless citing a specific paragraph, all publications, patent applications, patents and other references mentioned herein are incorporated herein by reference in their entirety. In the event of a conflict, this specification and the definitions included therein shall prevail. In addition, materials, methods and examples are illustrative only and not restrictive.

[0049] The technical solutions, implementation processes and principles of the present invention will be further explained below through specific examples. It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise stated, the reagents and raw materials used in the following examples are commercially available, and the test methods for which specific conditions are not specified are generally carried out under conventional conditions or according to the conditions recommended by the manufacturers. Furthermore, unless otherwise stated, the experimental methods, detection methods, and preparation methods disclosed in the present invention all adopt conventional techniques in this technical field. These technologies have been fully described in the existing literature.

[0050] The test methods and standards for the performance parameters of the following embodiments and comparative examples of the present invention are as follows: (1) Grafting rate: The grafting rate of TA in the grafted product was calculated by acid-base titration.

[0051] Weigh 1.0 g of the purified grafted product and heat it under reflux in 50 mL of xylene for 30 minutes to fully dissolve the grafted product. Then, titrate with a 0.1 mol / L KOH-ethanol standard solution using colorless phenolphthalein test solution as an indicator. Add the solution dropwise with continuous stirring. When the solution turns red, record the volume of KOH-ethanol standard solution used (V1). Back-titrate with a CH3COOH-ethanol standard solution of the same concentration. Stop the titration when the solution turns from red to colorless, and record the volume of CH3COOH standard solution used (V2). Follow the above experimental steps for three measurements and take the average value. Calculate the grafting rate (GR) using the following formula: ; Where, C is the concentration of KOH and CH3COOH-ethanol standard solution (mol / L); M is the relative molecular weight of TA (g / mol); and m is the mass of the grafted sample to be titrated (g).

[0052] (2) Melt index: Refer to GB / T 3682-2000 standard, use melt flow rate meter to measure the mass of sample flowing out from the die of special equipment within ten minutes, which is the melt index. The test conditions are as follows: temperature 230℃, weight 2.16kg Each sample was tested five times and the average value was taken.

[0053] (3) Mechanical properties: The tensile strength was tested according to ISO 527-1 / -2, the flexural strength and flexural modulus were tested according to ISO 178, and the notched impact strength of simply supported beams was tested according to ISO 179 / 1eA.

[0054] The technical solution of the present invention is described in detail below through specific embodiments.

[0055] Example 1 The preparation method of the compatibilizer provided in this embodiment specifically comprises the following steps: Weigh 100 parts of polyolefin elastomer, 6 parts of cis-1,2,3,6-tetrahydrophthalic anhydride, and 0.6 parts of a composite initiator (comprised of dicumyl peroxide and 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide (NITR) in a 1:1 mass ratio) and mix thoroughly in a high-speed mixer. After mixing, add the materials to the feed port at a feed speed of 10 rpm. The processing temperature is 210°C. The twin-screw extruder section temperatures are set at 170°C, 180°C, 190°C, 200°C, 205°C, 205°C, 210°C, 210°C, 210°C, and 190°C, with a screw speed of 200 rpm. The extrudate is cooled in a cooling water trough and pelletized to obtain the grafted product, which is compatibilizer 1.

[0056] The raw material composition and processing conditions of this example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0057] Example 2 The preparation method of the antibacterial agent provided in this embodiment is basically the same as that in Example 1 in terms of the proportions of the components and the preparation method, except that the amount of the initiator used in this embodiment is 0.5 parts.

[0058] The obtained grafted product is compatibilizer 2#.

[0059] The raw material composition and processing conditions of this example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0060] Example 3 The component ratio and preparation method of the compatibilizer of this embodiment are basically the same as those of Example 1, except that the amount of the grafting monomer used in this embodiment is 4 parts.

[0061] The obtained grafted product is compatibilizer 3#.

[0062] The raw material composition and processing conditions of this example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0063] Example 4 The component ratio and preparation method of the compatibilizer of this embodiment are basically the same as those of Example 1, except that the amount of the grafting monomer used in this embodiment is 8 parts.

[0064] The obtained grafted product is compatibilizer 4#.

[0065] The raw material composition and processing conditions of this example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0066] Example 5 The component ratio and preparation method of the compatibilizer in this embodiment are basically the same as those in Example 1, except that the processing temperature in this embodiment is 200°C, and the temperature settings of each section of the twin-screw extruder are: 160°C, 170°C, 180°C, 190°C, 195°C, 195°C, 200°C, 200°C, and 190°C.

[0067] The obtained grafted product is compatibilizer 5#.

[0068] The raw material composition and processing conditions of this example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0069] Example 6 The component ratio and preparation method of the compatibilizer in this embodiment are substantially the same as those in Example 1, except that the screw speed in this embodiment is 250 rpm.

[0070] The obtained grafted product is compatibilizer 6#.

[0071] The raw material composition and processing conditions of this example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0072] See Figure 1 , is the infrared spectrum of the compatibilizer POE-g-TA prepared in Example 1 to Example 6. As can be seen from the figure, the wave number is 1780 cm -1 and 1710 cm -1 An obvious characteristic peak appears at , which corresponds to the C=O stretching vibration peak of the anhydride in the TA structure.

[0073] Comparative Example 1 The component ratio and preparation method of the compatibilizer in this comparative example are basically the same as those in Example 1, except that the amount of initiator used in this comparative example is 1.2 parts.

[0074] The obtained grafted product is compatibilizer 1'#.

[0075] The raw material composition and processing conditions of this comparative example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0076] Comparative Example 2 The component ratio and preparation method of the compatibilizer in this comparative example are basically the same as those in Example 1, except that the processing temperature in this comparative example is 230°C, and the temperature settings of each section of the twin-screw extruder are: 170°C, 180°C, 190°C, 200°C, 220°C, 220°C, 230°C, 230°C, 230°C, and 220°C.

[0077] The obtained grafted product is compatibilizer 2'#.

[0078] The raw material composition and processing conditions of this comparative example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0079] Comparative Example 3 The component ratio and preparation method of the compatibilizer in this comparative example are substantially the same as those in Example 1, except that the screw speed in this comparative example is 350 rpm.

[0080] The obtained grafted product is compatibilizer 3'#.

[0081] The raw material composition and processing conditions of this comparative example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0082] Comparative Example 4 The only difference between this comparative example and Example 1 is that the initiator used is 0.6 parts of dicumyl peroxide (DCP), and the other steps and conditions are the same.

[0083] The obtained grafted product is compatibilizer 4'#.

[0084] The raw material composition and processing conditions of this comparative example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0085] Comparative Example 5 The only difference between this comparative example and Example 1 is that the initiator used is 0.6 parts of 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide (NITR), and the other steps and conditions are the same.

[0086] The obtained grafted product is compatibilizer 5'#.

[0087] The raw material composition and processing conditions of this comparative example are listed in Table 1, and the test results of the product melt index and anhydride grafting rate are listed in Table 1.

[0088] Table 1 Raw material composition, processing conditions, grafting rate and melt index of each embodiment and comparative example

[0089] As can be seen from Example 1, Example 3 and Example 4, the higher the content of the grafted monomer, the higher the grafting rate. This is mainly because the increase in the monomer content can increase the number of effective collisions between it and the grafted resin free radicals, increase the collision probability, and thus improve the grafting rate. However, when the monomer content increases to a certain extent, the increase in the grafting rate tends to be stable. As can be seen from Example 1, Example 2 and Comparative Example 1, with the increase in the amount of initiator added, the grafting rate shows a development trend of first increasing and then decreasing. This is attributed to the fact that the increase in the initiator within a certain range is conducive to inducing the polymer macromolecules to produce more free radicals, increasing the grafting sites on the macromolecular chain, thereby increasing the contact probability with the monomer. However, when the amount of initiator added exceeds a certain limit, it will cause the free radical concentration to be too large, resulting in an intensification of the coupling reaction between the free radicals, which will hinder the grafting reaction between the macromolecular free radicals and the monomer.

[0090] It can be seen from Example 1, Example 5 and Comparative Example 2 that the grafting rate also shows a trend of first increasing and then decreasing with the increase of processing temperature. Combined with theoretical analysis: processing temperature affects the efficiency and activity of the grafting reaction by affecting the decomposition rate of the initiator. At lower temperatures, NITR in NITR-DCP tends to covalently bind to the growing free radicals to form dormant species. At this time, the decomposition rate of DCP is also slow, which makes the grafting reaction rate of the system low; as the temperature rises, the NITR dormant species can reversely split to form growing free radicals, while accelerating the decomposition of DCP, so that the composite initiator system can induce the production of more macromolecular free radicals, which is conducive to the occurrence of grafting reaction. When the temperature is too high, excessive macromolecular free radicals can easily cause side reactions such as cross-linking and coupling, inhibiting the grafting reaction.

[0091] It can be seen from Example 1, Example 6 and Comparative Example 3 that when the screw speed is 200 rpm, the grafting rate of the system is the highest. When the screw speed is increased to 350 rpm, part of the initiator is squeezed out before it has time to decompose and take effect, which is equivalent to a reduction in the effective content of the initiator participating in the reaction, resulting in a significant decrease in the grafting rate.

[0092] The compatibilizers prepared in Example 1 (compatibilizer 1#), Example 2 (compatibilizer 2#), Example 3 (compatibilizer 3#), Example 4 (compatibilizer 4#), Example 5 (compatibilizer 5#), Example 6 (compatibilizer 6#), and Comparative Examples 1 to 3 (compatibilizer 1'# to compatibilizer 3'#) were applied to a glass fiber reinforced nylon 66 system, as follows: Example 7 67 parts of nylon 66, 30 parts of glass fiber, 3 parts of compatibilizer 1# obtained in Example 1, and 0.3 parts of antioxidant 1098 were weighed and mixed in a high-speed mixer. The mixture was then placed in a twin-screw extruder set at an extrusion temperature of 270°C, a screw speed of 400 rpm, and a feed speed of 20 rpm. The extrudate was cooled in a cooling water tank and pelletized to obtain modified nylon pellets. Test bars were then injection molded. The mechanical property test results are listed in Table 2.

[0093] Example 8 The preparation method of the modified nylon in this example is substantially the same as that in Example 7, except that the compatibilizer in this example is selected from the compatibilizer 2# obtained in Example 2. The mechanical property test results are listed in Table 2.

[0094] Example 9 The preparation method of the modified nylon in this example is substantially the same as that in Example 7, except that the compatibilizer in this example is selected from the compatibilizer 3# obtained in Example 3. The mechanical property test results are listed in Table 2.

[0095] Example 10 The preparation method of the modified nylon in this example is substantially the same as that in Example 7, except that the compatibilizer in this example is selected from compatibilizer 4# obtained in Example 4. The mechanical property test results are listed in Table 2.

[0096] Example 11 The preparation method of the modified nylon in this example is substantially the same as that in Example 7, except that the compatibilizer in this example is selected from the compatibilizer 5# obtained in Example 5. The mechanical property test results are listed in Table 2.

[0097] Example 12 The preparation method of the modified nylon in this example is substantially the same as that in Example 7, except that the compatibilizer in this example is selected from the compatibilizer 6# obtained in Example 6. The mechanical property test results are listed in Table 2.

[0098] Example 13 The preparation method of the modified nylon in this example is basically the same as that in Example 7, except that the amount of compatibilizer added in this example is 5 parts. The mechanical property test results are listed in Table 2.

[0099] Comparative Example 6 The preparation method of the modified nylon in this comparative example is basically the same as that in Example 7, except that the compatibilizer in this comparative example is selected from the compatibilizer 1'# obtained in Comparative Example 1. The mechanical property test results are listed in Table 2.

[0100] Comparative Example 7 The preparation method of the modified nylon in this comparative example is substantially the same as that in Example 7, except that the compatibilizer in this comparative example is selected from the compatibilizer 2'# obtained in Comparative Example 2. The mechanical property test results are listed in Table 2.

[0101] Comparative Example 8 The preparation method of the modified nylon in this comparative example is substantially the same as that in Example 7, except that the compatibilizer in this comparative example is selected from the compatibilizer 3′# obtained in Comparative Example 3. The mechanical property test results are listed in Table 2.

[0102] Comparative Example 9 This comparative example is substantially the same as Example 7, except that no compatibilizer is added in this comparative example. The mechanical properties test results are listed in Table 2.

[0103] Comparative Example 10 This comparative example is substantially the same as Example 7, except that the compatibilizer in this comparative example is selected from the compatibilizer 4′# obtained in Comparative Example 4. The mechanical property test results are listed in Table 2.

[0104] Comparative Example 11 This comparative example is substantially the same as Example 7, except that the compatibilizer in this comparative example is selected from the compatibilizer 5′# obtained in Comparative Example 5. The mechanical property test results are listed in Table 2.

[0105] Table 2 Performance test results of modified nylon resins in various examples and comparative examples Tensile strength (MPa) Flexural strength (MPa) Flexural modulus (MPa) <![CDATA[Notched impact strength of simply supported beam (kJ / m 2 )]]> Example 7 170 244 7450 13.8 Example 8 168 241 7400 13.6 Example 9 167 239 7350 12.5 Example 10 174 253 7550 13.9 Example 11 173 251 7500 13.0 Example 12 171 247 7450 12.8 Example 13 164 237 7300 15.4 Comparative Example 6 165 236 7050 10.8 Comparative Example 7 163 230 6900 10.6 Comparative Example 8 164 235 7050 10.9 Comparative Example 9 190 255 7850 7.9 Comparative Example 10 166 238 7050 11.2 Comparative Example 11 168 240 7300 10.8 The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any changes, modifications, substitutions, integrations, or parameter changes to these embodiments, which fall within the spirit and principles of the present invention and achieve the same functionality through conventional substitutions, without departing from the principles and spirit of the present invention, fall within the scope of protection of the present invention.

Claims

1. A compatibilizer, characterized in that: It is prepared by reacting polyolefin elastomer, grafting monomer and initiator; The grafting monomer is cis-1,2,3,6-tetrahydrophthalic anhydride; The initiator is a compound of initiator A and initiator B; wherein the initiator A is selected from 4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide; The initiator B is selected from at least one of dicumyl peroxide, di-tert-butyl peroxide, benzoyl peroxide, tert-butyl perbenzoate, and diisopropyl peroxydicarbonate.

2. The compatibilizer according to claim 1, characterized in that The added amount of the grafting monomer accounts for 2-10 wt % of the polyolefin elastomer.

3. The compatibilizer according to claim 1, characterized in that In the initiator, the mass ratio of the initiator A to the initiator B is 1:(1-1.2).

4. The compatibilizer according to claim 1, characterized in that The compatibilizer components are as follows, in parts by mass: 100 parts of polyolefin elastomer, 2 to 10 parts of the grafting monomer, and 0.5 to 1 part of the initiator.

5. A method for preparing a compatibilizer according to any one of claims 1 to 4, characterized in that: The polyolefin elastomer, grafting monomer, and initiator are added to a high-speed mixer and mixed uniformly; then, they are fed into a twin-screw extruder through a feed port, and reaction conditions are set for reaction and extrusion; finally, after cooling, pelletization is performed to obtain the grafted product, namely POE-g-TA.

6. The preparation method according to claim 5, characterized in that The reaction conditions include a reaction temperature of 200-220°C; a screw speed of 200-300 rpm; The feeding speed is 10-20 rpm.

7. Use of the compatibilizer according to any one of claims 1 to 4 in the preparation of modified nylon materials.

8. A modified nylon material, characterized in that: The compatibilizer comprises the compatibilizer according to any one of claims 1 to 4, nylon, and a toughening agent; the toughening agent is glass fiber.

9. The modified nylon material according to claim 8, wherein Calculated by weight, the modified nylon material comprises: 50-70 parts of nylon, 25-40 parts of glass fiber, 3-9 parts of compatibilizer and 0.2-0.4 parts of antioxidant.

10. The modified nylon material according to claim 8 or 9, characterized in that: The nylon is nylon 66 or nylon 6; the antioxidant is antioxidant 1098.

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